Milling cutter



Aug. 25,1925; i D E, DucHEsNE LING GUTTER Filed Jan. 1B. 1924 i 2 M a .2

slot.. and gradually tapering to zero depth -unirsi) STATES ERNEST DUCHESNE. or sciinnjecwany. New YORK.

To all'who'm it' may concern.' v

Be it known that I, EnxEsT Dr'ciiigsxn, of Schenectadygin the county of Schenectadyand State 'ot New York, have invented acer-- tain new and useful Improvement in Milling Cutters. of which improvement the following is a specication.

The object of my invention is to 'provide a milling cutter which shall present the ad-A vantages of being much more readily inacliined. in manufacture. alid of having longer bladelits than those of 'pri-or construction: 'affording maximum bearing for its blades on its body; and, which. in operation. will `afford ample space for chip clearance and constitute a free Working cutter.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings: Figure 1 is a side View, in elevation. oi a milling cutter embodying my invention; Fig. Q. a face view of the same: Fig. 3. a section on the line 2-2 of Fig. 2; and Fig., ll. an axial section' on line 4-4 of Fig. 3.

i In the practice of my invention, referring descriptively to the specific embodiment -tliercof which is herein exemplified. the body. l, of the cutter. is of cylindrical torni. and of less diameter than the. finished cutter. nd lis provided with bosses, l. on its sides. and `with an axial bore. 1b. to tit on the arbor ot -the machine in u'hich the cutter is to be operated. a key Way. Ic. being cut in said bore.

A pluralityT oi blade slots. 1d. is cut in the periphery of the body. extending entirely `across it, said slots being inclined in alternately opposite directions. the opposite ends of each blade slot extending into the adjoin. ing slots, as most clearly indicated in Fig. -The blade slots, are Ialso inclined at a propercutting angle with the axial line ot tl'ieb'ody, and bevels. le.' are cut in the edges of the body. in front of each blade slot to give inaxifV muni cliipclearanee, the bevels starting with ay maximum depthjust forivard ot each blade at the' back of the preceding blade slet.

A plurality of blades. F?, is fitted in the blade sl its. each blade having one of its ends projecting beyond one of the. sides or diametral faces oi' the body. and having a cutting lip, 2, extending from l said end. slight ly lbeyond the middle diam'ctral plane et the. body. The blades are bevelled from the in ner ends of their cutting lips. for the remainder of their length to the adjacent side Application led january 18,:1924. 'Serial- No; 686,998. v`

of the body, tlieiivbey'clled faces, 2b, being shown in Figs. l, and The back end'of each' blade abuts against the front face of the .i"ollo\ving blade, thereby lockingr the blades against: lateral movement when cutting in service. This manner of locking the blades diii'ers substantially from that ordi? -narily practicedA in cutters of the general type' to which my 'invention relates, in Whic-i.` the blade slots are cut only part iva-y across the body. and the blades are caused to abut against tlieinnei" or blind ends of the Slots. Caulking groovese lf,-are formedA in the body, 1 adjacent to the blade slots, for enabling the'blades to be tightened therein.-

The berelli-ng of the rear' portions of the blades eliminates all possibility of making a dragging cut. as both the front Side and the top of the cutting portion ot the blade retain a positive cutting angle. Whereas when the cutting edge of the blade is made continuous acrosstlie body. as in prior practice, the cutting angle at the base becomes excessive, and the rear side cutting lip drags.

It will be obvious to those skilled in the art. that the provision' of straight blade slots, extending continuously across the periphery of the body. greatly facilitates the macliining of the body; thatthe abutting relation of the blades eii'ectually locks them against lateral movement; and that longer blade fits are practicable than in cutters of the ordinary con- Strnctior.. by reason of the extension of the blades entirely across the body. The bevel ling of the rear ends of the blades and the edges of the body. affords ample space for chip clearance and ensures a freely working' cutter.^and the tapering to the zero recess. of the body bevels. at the iear of the blade slots. affords a. maximum extent of bearing `,tor the blade intlie face of the body.

PATENT OFFICE.

'MILLINGcti'rmiiai. i v Q I claim as my inventicniand desire to secure, by Letters Patent: l

A1. In Aa milling cutter. the combination o f a body. having a plurality of inclined blade ing its edges gradually relieved radially from a maximum depth at one blade slotto a zero depth at the next succeeding slot: and a plurality of cutting blades. fitted vin said slots. each of said blades abutting against a following blade.

2. In a milling cutter. the combination of a body having a plurality of alternately reversely inclined blade slots extending entirely across the periphery of the body, each lmi) ' slots extending across its periphery, and liavprovide chip clenreneeland alblade litted in each slot with. one end projecting beyond the end of the slot, and having a cutting lip extending from said projecting end to a point slightly beyond the central longitudinal plane of the body. 10 3. In a milling cutter, the combinationof a body, having la, plurality of inclined .blade slots extending across its periphery; and a plurality of cutting blades, fitted inn Saifk slots, .each of vsaid blades abutting against a following blade, and having a cutting lip vextending partly-ac1oss the body, and e. bev elled face extending therefrom to one side of the body.

ERNEST DUCHESNE. 

